stolen base

Noun

 * 1)  A play where a runner on any base runs to the next base, usually while the pitcher pitches to a batter. Such a runner is liable to be put out if tagged with the ball while not in contact with any base.

Coordinate terms

 * , when a runner is unsuccessful and is thrown out
 * , when the runner is not credited with a stolen base because the team playing the field did not try to stop the steal